“Some uncertainty surrounds how much snow will occur, but several centimetres of snow is likely even at low levels, especially in a swathe through Wales and the Midlands, where there is the potential for an amber warning.

“Where snow does occur accumulations of two to four centimetres are likely even to lower levels, with more than 10cm on high ground.

“There is the risk of 10-15cm, even at low levels, parts of Wales and the Midlands being most at risk.